Engineering Core Analysis
- Servet Unalmiser (Saudi Aramco) | James J. Funk (Saudi Aramco)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- April 1998
- Document Type
- Journal Paper
- 106 - 114
- 1998. Society of Petroleum Engineers
- 5.1.5 Geologic Modeling, 2.5.2 Fracturing Materials (Fluids, Proppant), 5.5.2 Core Analysis, 5.1 Reservoir Characterisation, 1.2.3 Rock properties, 5.7 Reserves Evaluation, 5.3.2 Multiphase Flow, 4.3.4 Scale, 5.3.4 Reduction of Residual Oil Saturation, 1.6.10 Coring, Fishing, 1.2 Wellbore Design, 5.6.2 Core Analysis, 1.10 Drilling Equipment, 1.6.7 Directional Drilling, 5.6.4 Drillstem/Well Testing, 5.6.1 Open hole/cased hole log analysis, 1.13 Casing and Cementing, 1.6 Drilling Operations, 5.2.1 Phase Behavior and PVT Measurements, 5.2 Reservoir Fluid Dynamics, 1.5 Drill Bits, 2.1.3 Sand/Solids Control
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Distinguished Author Series articles are general, descriptiverepresentations that summarize the state of the art in an area of technology bydescribing recent developments for readers who are not specialists in thetopics discussed. Written by individuals recognized as experts in the area,these articles provide key references to more definitive work and presentspecific details only to illustrate the technology. Purpose: to informthe general readership of recent advances in various areas of petroleumengineering.
Core analysis has come a long way from the days when reservoir productivitywas determined by blowing through a piece of cable-tool-produced core. Ourtools and methods for drilling and core analysis have changed, but ourinterests have not. The reservoir-rock properties that determine hydrocarbonproduction, the variation in these properties, and how these properties affectultimate recovery are still of primary concern. Properly engineered coreanalysis provides a direct measurement of these reservoir-rock properties andis an essential step in formation-evaluation, reservoir, and productionengineering. Fundamental core-analysis measurements are unchanged, but advancesprovide the ability to test at reservoir conditions and to acquire simultaneousmeasurements of reservoir-dependent properties. Core analysis today uses X-raycomputerized tomography (CT) to determine two- and three-dimensional (2D and3D, respectively) porosity distributions, while continuing to apply Boyle's lawand Archimedes' principle to determine porosity. Mercury injection is usedroutinely to describe pore-throat distributions, but nuclear magnetic resonance(NMR) is becoming a popular method to delineate relationships between poreradii and permeability. This review addresses some recurrent concerns of coreanalysis as well as some new approaches and insights that are part of thephysical reservoir model determined by core analysis. Refs. 1 through 6 providemore information on the subject.
Coring and Field Operation
Reservoir studies seeking to interpret and define both geological andengineering parameters dictate the core-analysis program. Core analyses mustintegrate with field and production data and eliminate reservoir uncertaintiesthat cannot be addressed with log, well-test, or seismic data. Theserequirements define the coring objectives that, in turn, control coring fluid,tools, and core handling. In most cases, these objectives cannot be obtainedwith core retrieved in a single well. Coring is thus an integral part of thereservoir-life-cycle process, with cored wells selected to verify or providemaximum information for the current geological, engineering, or productionmodel of the reservoir.
|File Size||189 KB||Number of Pages||7|